You are certainly moving into the professional - and expensive - range of machinery here!
There will also be a significant price difference between the two.
Naturally I am biased towards the Honda, perfectly made and this model has a driveshaft rather than belt transmission. Being hydrostatic drive means a huge replacement bill if this item fails of course. It has a roto stop, like your last one.
Only speaking personally here but I have found that Hayter have fallen behind quality wise in the past but of course things can change........I didn't like the variable pulley speed system but again, this may no longer be current.
You may like to look at other makes, by Stihl Viking or John Deere for example - I notice these machines are popular with local authorities but of course this could be due to getting a good financial deal rather than longevity.
John